2142561 has 16 divisors (see below), whose sum is σ = 3098304. Its totient is φ = 1311744.

The previous prime is 2142557. The next prime is 2142577. The reversal of 2142561 is 1652412.

It is not a de Polignac number, because 2142561 - 2² = 2142557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2142521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1705 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (193644).

2^2142561 is an apocalyptic number.

It is an amenable number.

2142561 is a deficient number, since it is larger than the sum of its proper divisors (955743).

2142561 is a wasteful number, since it uses less digits than its factorization.

2142561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040.

The product of its digits is 480, while the sum is 21.

The square root of 2142561 is about 1463.7489538852. The cubic root of 2142561 is about 128.9172596033.

Adding to 2142561 its reverse (1652412), we get a palindrome (3794973).

It can be divided in two parts, 214 and 2561, that added together give a triangular number (2775 = T₇₄).

The spelling of 2142561 in words is "two million, one hundred forty-two thousand, five hundred sixty-one".